In 2011, the Middleton family reportedly covered the cost of Duchess Kate's gown, a custom Alexander McQueen design, which isrumored to be worth $434,000, though it's unclear what they actually paid for it.

Taxpayers will also contribute to the day, in the form of security. Dunne's number above likely doesn't include this cost. While it is unclear exactly how much was spent on security at Prince William and Duchess Kate's 2011 London nuptials, some estimatesput it at $32 million, andaccording to CNN, the "government provided the police with a special £3.6 million ($4.8 million) grant that was used to cover overtime pay for officers."

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In London, mounted police help to monitor the crowd as they walk along the processional route to Buckingham Palace following the wedding of Prince William to Kate Middleton in 2011.

Antimonarchists are less than thrilled with this arrangement. "Prince Harry and Meghan Markle are finally engaged. That's good for them, but not so much for the rest of the United Kingdom,"wrote Jacob Shamsian in Insider."The monarchy is an arguably outdated, immoral institution and a lavish wedding is equally wrong. Let's do away with it all."

Morality aside, the 2018 royal weddingis expectedto provide a £500 million pound boost to the country's economy in the form of tourism, commemorative merchandise, and essentially "free advertising for Britain."